package com.qikecn.yunpan;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.math.BigInteger;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.security.MessageDigest;

import com.alipay.api.internal.util.StringUtils;
import com.qikecn.utils.FileUtil;

public class Utils {
	
	public static String getMimetype(String filename) {
		if(StringUtils.isEmpty(filename)) {
			return "";
		}
		String suffix = FileUtil.getSuffixByFilename(filename).toLowerCase();
		if(suffix.equals("png")) {
			return "image/png";
		}else if( suffix.equals("jpg") || suffix.equals("jpeg")) {
			return "image/jpeg";
		}else if( suffix.equals("gif") ) {
			return "image/gif";
		}
		return "";
	}

	public static String getMd5ByFile(File file) throws FileNotFoundException {
		String value = null;
        FileInputStream in = new FileInputStream(file);
        try {
		    MappedByteBuffer byteBuffer = in.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, file.length());
		    MessageDigest md5 = MessageDigest.getInstance("MD5");
		    md5.update(byteBuffer);
		    BigInteger bi = new BigInteger(1, md5.digest());
		    value = bi.toString(16);
		} catch (Exception e) {
		    e.printStackTrace();
		} finally {
	            if(null != in) {
		            try {
			        in.close();
			    } catch (IOException e) {
			        e.printStackTrace();
			    }
		    }
		}
		return value;
	}
	
}
